Gas range burner



May 25, 1943 L' Ros GAS RANGE BURNER Filed VJune 6. 1939 m.. n.. D .7%

nnnnnnnnnln Patented May 25, 1943 UNITED STATES PATENT OFFICE GAS RANGE BURNER Application June 6, 1939, Serial No. 277,717

1 Claim.

My invention relates to improvements in gas range burners of the so called round or ring type, and is adapted for use singly or in multiples of two or more.

One of the objects of the invention is to provide a reversible or interchangeable burner which is adaptable for attachment to and for use with either a front or rear burner mixing tube.

Another object of the invention is to provide a burner structure which will insure uniform pressure on the lighter port of each burner in the burner assembly regardless of the number of burners or length of the mixing tubes thus eliminating objectionable variation in lighting characteristics at the various burners.

Still another object of the invention is to provide means for reducing the gas velocity at the discharge end of the central burner ports.

A further object is. to insure uniform static pressure and therefore uniform volumetric flow of gas from each of the parts of the burner.

A still further object of the invention is to pro vide a uniform supply of secondary air to al1 sides of the inner or central ports of the burner.

Other objects and advantages of the invention will be understood as the specication is considered with the accompanying drawing, in

which: Y

Figure 1 is a plan view of the improved burner;

Figure 2 is a side view of the burner showing the body portion in section, the mixing tube being shown broken away;

Figure 3 is an end view of the burner;

Figure 4 is a section through the burner head;

Figure 5 is a bottom plan view of the burner;

Figure 6 is a bottom plan view of the burner head; and

Figure 7 is a top plan of the outlet end of one of the mixing tubes.

Referring more particularly to the drawing I denotes a preferably cast round burner body portion having an integral hollow depending extension 2 which communicates with a substantially bowl shaped expansion chamber 3, formed in the burner body I. This extension serves the double purpose of providing means for attaching the burner body to a mixing tube, in a manner presently described, and an advantageous place for locating a lighter orifice 4, to receive the customary injection nipple carried by the ilash tubes, not shown, for conveying gas from the main burners to a remote pilot burner, also not shown.

An interior preferably cast member or head 5, of annular shape is formed with a reduced threaded hollow lower portion 6 which screws into the threaded central opening I formed in the bottom Wall of the expansion chamber 3. The under peripheral face of head 5 is provided with horizontally disposed radially extending teeth 8 separated by spaces or grooves 9. When the head is screwed home these teeth contact the smooth upper face Ii) of the horizontally disposed peripheral rim portion of the body I, and the spaces 9 therebetween constitute the outer row of burner ports. A plurality of upwardly and inwardly inclined equally spaced holes II drilled through or cast in the hub portion I2 of the head and leading to and extending through the dished centrally disposed substantially cone shaped area I3, formed in the outer face of the head, constitute the inner row of ports for the burner.4 The discharge ends of these ports II, are spaced slightly from the upper end of the tubular bore or openin-g I4` which supplies secondary air for supporting combustion at these ports and the latter taper and increase in size from their lower inlet to their upper outlet ends as illustrated in Figure 4. The purpose of this form of drilling is to reduce the velocity of the gas discharged from the ports, thus greatly reducing the danger of the flame extinguishing itself or burning at some distance from the burner head.

The burner head 5 is also formed with a flat peripheral portion 29, into which the dished centrally disposed substantially conical area I3 merges. That portion of the conical area I3, extending from a point slightly beyond the confines of a circle enclosing the ports II, to the inner edge or periphery of the iiat portion 29, is formed with a circular groove or recess 30, the bottom wall of which lies in a plane parallel to but slightly recessed with respect to the face of the conical inner ring like portion SI, of the conical area I3, through which the discharge ends of the ports II extend. This groove 30 receives and is always lled by secondary air flowing through secondary air opening I4, and serves to convey air to the back or outer sides of the ports I I, which otherwise would receive an inadequate supply. Each port II may also be surrounded with a circular recess 32, for the same purpose, but this is not necessary where the groove 30 is employed. These grooves obviate the necessity of providing the burner with raised ports which would destroy the stream line effect which I obtain and interfere with cleaning and polishing operations.

The lower end of the hollow depending extension 2, is slightly oifset as at Il, and this offset portion is provided with a uniplanar flange 33, formed with apertured ears |8 for the reception of bolts or the like I9 which are employed to secure fthev burner to the upturned discharge end 20 of a conventional mixing tube 2|. The other lor inlet end of the mixing tube is connected to and receives its supply of gas from the usual manifold not shown. The necessary primary air to support combustion passes in through the usual air opening, not shown, in the inlet end of the tube and thence through the mixing tube, and is mixed therein with the gas, as is well understood by workers in the art.

It will be noted that the upturned end 20 ofV mixing tube 2| is formed with a flat faced smooth flange 22' .lincluding oppositely disposed apertured ears 23 through which the bolts I9 extend. The face of this ilange is identical in shape and size to the smooth end face of depending extension 2 and the apertures 24 in the ears 23 correspond in size and location with the threaded apertures 34 in ears I8 of hollow extension 2. Consequently the burner' can be mounted on either a iront mixing tube 2| or a rear mixing tube 25, by facingY the burner in an appropriate direction. The tubes are identical except that the tube 2| for supporting a front burner is somewhat shorter than the rear burner mixing tube 25 and the latter is curved so that the burners will'be properly aligned.

Gas issuing from the mixing tube reaches the inner and outer ports through the inlet passage 2`| in extension 2' which discharges into the expansion chamber 3.

It is essential that a constant high static burner head pressure be maintained and that the volumetric ow from each of the burner ports be uniform and equal. This is accomplished by slanting the bottom wall I5 upwardly and butwardly from the depending extension 2 to the periphery of the substantially bowl shaped expansion chamber 3, to gradually restrict the latter. By thus 4restricting this chamber beginning at the gas inlet thereto and gradually and uniformly decreasing its size as it approaches the ports remote from the inlet passage 21 of extension 2, the static pressure is automatically and evenly built up so that the gas flow through those ports closest to the point of discharge of gas into the expansion chamber will be the same as from those ports most distant from this point.

Having thus described my invention, what I claim is:

A gas burner comprising an outer body member formed with a substantially cup-shaped expansion chamber and having a rim portion, a burner head member mounted in said body member and having an outwardly flared upper end forming the top of said expansion chamber, radially disposed spaced burner ports between said rim and said' flared upper end, said body member having a depending hollow extension, said extension formed with a hollow ciset positioned at one side of said body member, said hollow extension andv said offset communicating with said cup-shaped expansion chamber, said expansion chamber having an upwardly and outwardly slanting substantially at .bottom wall extending from said hollow oiset on one side of said body member to the other side thereof, whereby said Vexpansion chamber is gradually and uniformly restricted in size in all directions leading from a point adjacent said depending extension and even and uniform static pressure is thus attained at all ports, said depending extension having a gas` inlet.

LAWRENCE J AROS. 

